SR626SW Battery, 1.55V Silver oxide battery, and SR626SW Battery Equivalent

SR626SW battery is a 6.8 x 2.6 mm silver-oxide battery with sodium hydroxide electrolyte which complies with the IEC 60086-3 watch batteries standard. SR626SW non-rechargeable button-coin cell batteries are commonly used in watches, micro LED flashlights, remote controls, cameras, calculators, and many other electronic devices.

• Voltage: 1.55 Volts

• Capacity: 27 mAh

• Chemistry:  Silver Oxide 

• Battery Size: Coin Cell 

• Shelf Life: 5+ Years

• Length - 0.10" (2.6 mm)

• Diameter - 0.26" (6.6 mm)

• Weight: 0.02 oz. (0.57 g)

Seiko Instruments SR626SW technical specifications, attributes, parameters and parts with similar specifications to Seiko Instruments SR626SW.

Alkaline 6.8 x 2.6 mm batteries are less expensive than silver oxide batteries.  and they have a shelf life of 2-3 years, a nominal voltage of 1.50 volts, a cutoff voltage of 0.8-1.0 volts, and a capacity of 12-18 mAh.

The following table compares the most popular silver oxide 6.8 x 2.6 mm batteries.  along with their key characteristics and specs.

377 Battery, SR66, SR626, SB-AW, 280-39, BA, V377, D377, 606, S626E, GP377, AG4, AG-4, 377, L626, SG4, LR626, LR66  , SR628SW, E377, E377CA, LR626SW, 377A, SR262SW, 377X, 377S, GP177, SR6265W, 377/376, E377A, SR66SW, SR625SW, 377BA, CR626SW, AG4/377, AG04

The following SR626SW watch battery  replacement chart compares and illustrates alkaline and silver-oxide 6.8 x 2.6 mm coin-cell batteries  :

As one can see, LR626/SR626 batteries  are available in two different chemistries:

Alkaline LR66  /LR626 batteries have a nominal value of 1.5 volts, which reduces to 1.0 volts quite quickly over time.

When utilizing alkaline AG4/LR66/LR626 batteries.  sensitive electronics may have problems running at such low voltages and may have reliability concerns.

Furthermore, as compared to silver-oxide batteries, their capacity is 30 percent lower when drained down to 1.0 volts and up to 50 percent lower when drained down to 1.2 volts.

The nominal voltage of silver-oxide SR626SW batteries is 1.55 volts, and it remains rather stable when the battery is discharged. Furthermore, these batteries have a higher capacity, allowing for a significantly longer operation duration for several devices with just one battery replacement.

Note that some silver oxide SR626 batteries are designed as high-drain batteries and are more suitable for digital watches and similar electronic devices, while other SR626 batteries are designed as low-drain batteries and are more suitable for analog watches, digital watches without alarms and LEDs, thermometers, and similar.

Small and shiny, SR626SW and similar button/coin-cell batteries can easily draw the attention of children and pets. As a result, smaller button/coin-cell batteries are available in pet and child-safe packaging.

If the SR626SW or a similar battery  is ingested, chemical burns can result from the electrolytic process, which occurs when bodily fluid short-circuit the battery, 

So, if an SR626SW or similar battery is swallowed, go to the nearest emergency room or veterinarian, explain what happened, and follow their advice.

Seiko Instruments Inc. (SII) was established in 1937 as a key watch manufacturing company for the Seiko Group. Based on its sophisticated micro mechatronics and nanotechnology techniques developed through decades of experience in precision machinery manufacturing and low-power consumption technologies, the company provides micromechatronic products and services including watch and HDD components; semiconductors, FPD and electronic devices; network solutions systems; nanotechnology equipment; scientific instruments; and large-format inkjet printers.